Unknown SB13PFCR25-4
Best box: 5.8 L bass reflex tuned to 56.3 Hz · F3 59.9 Hz
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Comparable 5.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Unknown SB13PFCR25-4 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 5.8 Liters |
| Tuning Frequency (Fb) | 56.3 Hz |
| F3 (-3 dB Cutoff) | 59.9 Hz |
| F6 / F10 Extension | 51.9 Hz / 44.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 28.4 cm |
| First Pipe Resonance | 605.0 Hz |
| Estimated MOL @ F3 | 99.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 105.2 Hz |
| F3 (-3 dB Cutoff) | 102.6 Hz |
| F6 / F10 Extension | 78.2 Hz / 59.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 44.0 Hz |
| Total Q (Qts) | 0.29 |
| Electrical Q (Qes) | 0.326 |
| Mechanical Q (Qms) | 2.6 |
| Equivalent Volume (Vas) | 13.4 Liters |
| Diaphragm Area (Sd) | 87.0 cm² |
| DC Resistance (Re) | 3.2 Ω |
| Efficiency Bandwidth Product (EBP) | 134.8 |
| Linear Excursion (Xmax) | 4.5 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 5.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Unknown SB13PFCR25-4?
Load Forge's calculated alignment puts Unknown SB13PFCR25-4 in a 5.8 liter vented enclosure tuned to 56.3 Hz, reaching an F3 cutoff of approximately 59.9 Hz.
Can Unknown SB13PFCR25-4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 102.6 Hz.
What port dimensions should be used for Unknown SB13PFCR25-4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 28.4 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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